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2+5(-2a+1)=-1-8a
We move all terms to the left:
2+5(-2a+1)-(-1-8a)=0
We add all the numbers together, and all the variables
5(-2a+1)-(-8a-1)+2=0
We multiply parentheses
-10a-(-8a-1)+5+2=0
We get rid of parentheses
-10a+8a+1+5+2=0
We add all the numbers together, and all the variables
-2a+8=0
We move all terms containing a to the left, all other terms to the right
-2a=-8
a=-8/-2
a=+4
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